Brake mechanism.



I'. H. OSBORN.

BRAKE MEGHANISM.

APPLIOATION FILED Imm, 1909.

904,890.A Patented Nov. 24, 1908.

` INVENTOR vso FREDERIC-K H. OSBORN, Ol" GABRISON, NEW YORK.

BRAKE BSECEANISM.

Specification of Letters Patent.

PntentedNov. 24, 1968.

y.tpplication tiled February 4, 1908. Serial No. 414,173.

To all whom( it may cofliceiw:

Be it known that I, FRnDniucii H. OsBoRN, a citizen of the United States of America, and a resident of Garrison, county oi' Putnam, and State of New York, have invented certain new and useful Improvements in Brake Mechanisms, of whichthe following is va specilication, reference being had-to the accompanying drawings forming a part thereof.

My invention relates to improvements in brake mechanisms such as are particularly adapted for use on phonographs, gramophones and similar sound reproducing instruments although the said brake mechanisms may be employed in connection with other machines.

in the ordinary type of commercial sound reproducing machines, it is necessary for an attendant to be present to stop or reset the machine when a record has been com leted, and if this is not promptly attendled to, damage to the machine is likely to result.

ln my present invention, 1 provide an electrically controlled brake forthis purpose, the circuit for which is closed by the movements of the arm which carries the sound reproducing means. The circuitis normally an open one and is closed by the arm as it reaches the, end of its movement. '.llic closing of the circuit causes the operation of the brake, and the brake mechanism includes a circuit interrupting device by which the circuit is again broken directly the brake is applied. By reason of this con-- `struction and arrangement oi' parts, I enr ploy a minimum oi' current in the operation of the device whereby l not .only operate ec'onomically, but am enabled to use a small battery without having to constantly ienew or recharge the same. I have also so arranged. designed and constructed the device :is to readily adapt the saine for use with the present style of machines. In other words, the device in its preferred 'form comprises an attachment rather than van integral portion of an entire machine.

ln order that my invention may be fully understood, l will describe an embodiment thereof having reference to the accompanying drawings illustra-ting the saine, and will then point out the novel tentures in claims.

ln the drawings: Figure l is a top View Ot a sound reproducing machine having a brake mechanism embodying my invention atcachedn thereto. Fig. 2 is-an enlarged top View of the brake mechanism removed from the machine, the casing therefor being shown in horizontal section. F ig. B is-a sectional view of the device and a portion ot' the machine with which it is employed@ the plane of section being taken substantially upon the line 3 3 of Fig. 2. Fig. lis a sectional View upon the plane*t ofthe line iiofrige.

The particular style of machine which 'l have selected for illustration is a sound reproducing machine employing a flat or disk form ot' record. This style of machine is sometimes termed a gramophone, and indeed various trade naines are often eniployed to variously designate diilerent specilic forms of machines. ln ,the present specification, I employ the `word, phonograph in its generic sense as including the different forms ot' sound reproducing ina` chilies thus variously designated.

The.` sound reproducing machine comprises a box or casing 5 in which isl contained the motor for driving the record carrying support. This record carrying slipport.coniprises a flat top disk mounted upon a central shaft 7 which is in constant -rotative connection with thc said motor.

The motor is commonly ot the spring driven type 1n commercial machines, and

`. the power ot' the motor is constantly applied to turningl the disk so long as the spring is under tension, or as is commonly expressed, so long as the spring is wound up.

The sound reproducing device 8 is cai'- ried by an arm 9 which is arranged to swing around an axis it). A record l1 is mounted upon the disk 6 and the stylus of the sound reproducing device is arranged to be in contact therewith and to follow the spiral groove therein as the disk rotates.

Secured to the casing 5 ot' the machine is an adjustable terminal contact point 12 located in thc path ot' movement ot' the said arm 9 and so positioned that. the said arm will engage it atabout the time the stylus of the` sound reproducingi` means reachesl the inner end o't' thc spiral groove in the record. rlhe arm itself is arranged to constitute. a second terminal tor an electric circuit whereby the contact of the arm with.

the aforementioned terminal 12 will serve to complete such electric circuit. Secured iin inner end of which is provided .With a brake i shoe 15. The plunger 14 is normally pressed in a direction toward the edge of the disk l terminal point 2l disposed within the box or 6 by means of a spring 16, but is normally held in a position wherein the brake shoe 15 is just outof contact with the said disk` i by means of a detent 1T which engages an abutment 18 carried by the said plunger,

111. This said detent is arranged to be tripped by means of an electro-magnetic,` v device comprising an electro magnet 19 and an armature, the lever 2O of the latter being 1 arranged to engage an arm 2l with which the said detent 17 is provided. The electro magnet- 19 is arranged in circuit with a battery or generator 26 and the terminals repi tit resented by the contact point 12 and the arin 19. armature 20 thereby attracted, the detent 17 will be moved out of the way of the abutment 18 and the spring 16 will be permitted Vhen the Circuit is completed and the 1 to force the plunger forward to cause the l brake shoe 15 to engage the disk and thereby to stop the machine. This, as above inentioned, will take place when the stylus of the sound reproducing device has reached the end of the record groove, and the arm i) has consequently reached a position to engage the terminal 12. The brake will have sufticient power to stop the machine against the tendency'ot the motor to rotate it, owing to the advantage of leverage in favor of the brake, and against the motor, due to the relatively large diameter of the disk and the relationship of the gearing.

To set the tripping device, it is only iiecessary7 to swing` the arm 21 back into its first position. The detent, during this movement, f

will engage the 'curved face 22 of the abutment, and will act as a cam to torce the plunger back to its initial position'.

"hen the parts are in their initial position, such being the position in which they l are shown in the drawings, and circuiti through the electro-magnetic' device broken, there will be no Vtendency for the detent to be tripped, until the electro-magiietic device is again operated, because oi" I the fact that the pivot for the said detent i in a line with the point of contact between the detent and the abutment 18, such as is substantially parallel with the path of movement of the plunger 14 and hence -to the said abutment 18.

For convenience in resetting parts, l have i l t i casing 13, whereby it may be readily ina-'7.

nipulated from the exterior thereof, (see particularly Figs. 3 and 1).

In order to open the vcircuit directly the brake is applied and before the arm 9 has i i l i l been moved out ol' engagement with the terminal point 12. l have provided a circuit interrupting device comprising a stationary casing 13 and a spring contact member carried by the' abutment 18. \Vhen the abutment moves 'forward with the plunger, at the moment the brake is applied, the spring contact member will be moved away from the terminal point 24,' and the circuit will be broken at this point. The circuit inay be traced as follows:

`*tai-ting from one side of the battery 2h, il may bc traced through the wire 2T t0 the coilsI 1S) ot' the electro-inagnetie device, thence through a wire 28 to the contact strip 25. thence troni the terminal point 2l through a wire 2H to the terminal point 12, and thence from the ai'iii i) through a wire 30 back to thc battery 2U.

'liat l claiin is:

1. brake mechanism comprising a bo: or casing, a spring pressed brake carrying plunger arranged to slide in right lines and provided with au abutment, a detentI pivoted at a point. in advance of the abutment. and adapted to engage said abutment at a` point substantially in a line passing through the axi.-` of the pivot of the detent and parallel to the path of movement of the plunger. tor holding the plunger against the action of the spring. an electro-magnetic device provided with an armature lever for engaging the said detent, a circuit. control'ler for the said elec- 1 tro-magnetic de\ice,`siich circuit controller including an adjustable terminal, and a traveling member for engagement therewith. and a circuit interrupter independent ot' the said circuit controller.

2. A brake mechanism comprising a box or casing, a spring pressed brake carrying plunger supported to slide in right. lines and provided with an abutment` a detent pivoted at a point in advance of the abutment and adapted to engage the said abutment at a point substantially in a line passing through the axis of the pivot of the detent, and parallel to the path of movement of the plunger.

for holding the plunger against the action i of the spring, an arm connected to the dctent and projecting through the casing whereby the detent may be manipulated by hand, an electro-magnetic device including an armature lever which is arranged to engage the said arm. a circuit controller for closing circuit through the said electro-niagnetic. device, and a circuit interrupter operated upon the tripping of the said brake.

FREDERICK H. OSBORN. iVitnesses:

E. L. Hown, C. A. Stmaiys'rioxinz. 

